深冷次序对75Cr1合金钢显微组织、力学性能和耐磨性的影响

Effects of Cryogenic Sequence on Microstructure,Mechanical Properties and Wear Resistance of 75Cr1 Alloy Steel

探讨了深冷次序对75Cr1合金钢显微组织、硬度、抗拉强度和冲击韧性以及耐磨性的影响。结果表明,淬火后立即进行深冷+回火处理,较先回火后深冷处理所获得铁素体尺寸更加精细,细小碳化物数量更多。此外,淬火后立即进行深冷+一次回火处理的力学性能显著优于其它工艺的力学性能,其硬度为471.5 HV,抗拉强度为1360.5 MPa,冲击韧性为16.2 J/cm^(2)。深冷次序不改变75Cr1合金钢的磨损失效机制,都是磨粒磨损和粘着磨损混合机制,但淬火后立即进行深冷+一次回火处理的耐磨性最好,其平均摩擦系数为0.84,磨损率为6.52×10^(-5)mm^(3)·(N·m)^(-1)。

The effects of cryogenic sequence on the microstructure,hardness,tensile strength,impact toughness and wear resistance of 75Cr1 alloy steel were investigated.The results show that the size of ferrite is finer and the amount of fine carbides is higher by cryogenic cooling and tempering treatment immediately after quenching than that of by tempering first and then cryogenic cooling.In addition,the mechanical properties of cryogenic cooling and primary tempering immediately after quenching are significantly better than that of other processes,with the hardness of 471.5 HV,tensile strength of 1360.5 MPa and impact toughness of 16.2 J/cm^(2).The wear failure mechanism of 75Cr1 alloy steel is not changed by cryogenic sequence,which is a mixture mechanism of abrasive wear and adhesive wear.However,the wear resistance of cryogenic cooling and primary tempering treatment immediately after quenching is the best,with an average friction coefficient of 0.84 and a wear rate of 6.52×10^(-5) mm^(3)·(N·m)^(-1).